Playwright MCP Server

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries full burden but only states it 'initiates the wait operation but does not wait for its completion'. It doesn't disclose behavioral traits like whether this is non-blocking, if it requires specific page state, timeout behavior, error handling, or how it interacts with other Playwright tools. This leaves significant gaps for a tool that likely involves asynchronous operations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, zero waste. The first sentence states the purpose, the second clarifies the behavioral nuance. It's front-loaded and appropriately sized for the tool's complexity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no annotations and no output schema, the description is incomplete for a tool that initiates asynchronous HTTP response waiting. It lacks details on expected behavior, error cases, dependencies (e.g., requires an active Playwright session), and how results are used with 'playwright_assert_response'. The minimal description doesn't compensate for the missing structured data.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema fully documents both parameters. The description adds no additional meaning beyond what's in the schema (e.g., no context on URL pattern syntax or ID usage nuances). Baseline 3 is appropriate as the schema handles the heavy lifting.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Ask Playwright to start waiting for a HTTP response') and resource ('HTTP response'), distinguishing it from siblings like 'playwright_assert_response' which retrieves the response. However, it doesn't specify what 'start waiting' entails operationally, keeping it slightly vague.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage by mentioning retrieval with 'playwright_assert_response', suggesting a two-step workflow. However, it lacks explicit guidance on when to use this vs. direct response handling or alternatives, and doesn't specify prerequisites like needing an active Playwright session.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.